A tasting with cucumbers is a great idea! The traditional use of pink salt is on onions and it looks so pretty. I am a little worried about the "ooh, salt = bad" thing although I don't think any of my friends have actually been told to cut out salt.
The bread idea too-- hmmm, maybe mix salt into butter. I've seen that done with fluer de sel and the texture is wonderful.
I was also thinking of putting a few grains of colored salt on the pale parts of composed salads such as white beans, goat cheese... Also thought of putting them on scoops of rice but I'm afraid people might think the black salt (at least) is sesame seeds and get a salty mouthful they didn't expect.
I'm going to do the cucumbers for sure. On a tray, different colors, with drinks. Thanks!